pnmcolormap
Create quantization color map for a PNM image. tldr-pages
On several platforms
Several platforms
Generate an image using only n_colors or less colors as close as possible to the input image
pnmcolormap n_colors path/to/input.pnm >path/to/output.ppmIdentifyUse the splitspread strategy for determining the output colors, possibly producing a better result for images with small details
pnmcolormap -splitspread n_colors path/to/input.pnm >path/to/output.ppmIdentifySort the resulting colormap, which is useful for comparing colormaps
pnmcolormap -sort path/to/input.pnm >path/to/output.ppmIdentify